马氏体不锈钢铸件冷弯开裂问题分析  

Analysis of cold bending cracking of martensitic stainless steel castings

作　　者：李永新 马进 赵国伟 LI Yongxin;MA Jin;ZHAO Guowei(KOCEL Steel Foundry Co.,Ltd.,Yinchuan 750021,Ningxia China)

机构地区：[1]共享铸钢有限公司,宁夏银川750021

出　　处：《中国铸造装备与技术》2021年第2期33-36,共4页China Foundry Machinery & Technology

摘　　要：主要针对大型水轮机转轮铸钢件冷弯开裂问题进行分析总结,提出降低铸件内非金属夹杂物等级,降低金相组织中δ-铁素体含量,提高试样自身致密性,杜绝试样缺陷等方面进行质量控制。最终提高弯曲性能符合率和铸件质量。The cold bending cracking of steel castings for large hydraulic turbine runners has been mainly analyzed and summarized in the text.It is proposed to control the quality by reducing the level of non-metallic inclusions in the castings&the content ofδ-ferrite in the metallographic structure,improving the compactness of the sample itself,and eliminating the test sample defects.Finally,the bending performance compliance rate and casting quality have been improved.

关 键 词：水轮机转轮 冷弯开裂 非金属夹杂物 Δ-铁素体 致密性 

分 类 号：TG247[金属学及工艺—铸造]